Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 592 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 211 + 529 = 740 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 459 + 122 = 581 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 67 × 77 = 5164 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 51 × 87 = 4439 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 65 × 84 = 5460 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 760 + 778 = 1538 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 95 × 82 = 7790 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 182 + 268 = 447 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 810 + 165 = 975 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 45 = 909 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 171 + 976 = 1149 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 175 + 797 = 973 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 28 = 868 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 31 × 61 = 1891 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 813 + 374 = 1189 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 987 + 565 = 1552 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 51 × 68 = 3468 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 453 + 106 = 559 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 411 + 541 = 950 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 155 + 917 = 1071 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 20 × 18 = 360 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 14 × 82 = 1148 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 93 × 61 = 5673 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 398 + 951 = 1349 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 803 + 555 = 1351 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 136 + 279 = 424 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 224 + 127 = 351 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 680 + 585 = 1259 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 64 × 30 = 1927 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 520 + 871 = 1398 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 93 × 33 = 3069 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 368 + 391 = 759 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 668 + 929 = 1597 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 922 + 441 = 1363 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 26 = 1552 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 828 + 623 = 1456 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 20 × 82 = 1640 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 81 × 90 = 7290 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 38 × 80 = 3038 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 96 × 31 = 2985 right or wrong? (a) Right (b) Wrong

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